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STMicroelectronics STM6825SWY6F
- Part No.:
- STM6825SWY6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
STM6825SWY6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
STM6825SWY6F from STMicroelectronics is a 5-pin precision voltage supervisor IC with integrated watchdog timer and manual reset input, designed for microprocessor power-on and brown-out monitoring in industrial embedded systems. It monitors VCC at 3.3 V (±2.5%), asserts active-low push-pull RST for ≥1.4 ms upon fault, guarantees reset assertion down to VCC = 1.0 V, and features 1.6 s watchdog timeout and 3 µA typical supply current.
For engineers reviewing the STM6825SWY6F datasheet, STM6825SWY6F pinout, STM6825SWY6F application, or STM6825SWY6F equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options - all grounded in ST's production-grade documentation (DocID11110 Rev 14).
Technical Context
The STM6825SWY6F implements a precision bandgap reference and comparator to monitor VCC against a fixed 3.3 V threshold (±2.5% over –40 to +85 °C). Its reset logic asserts RST low on VCC dropout, MR low, or WDI timeout, with guaranteed valid output down to VCC = 1.0 V and a 1.4 ms minimum reset pulse width.
It integrates a self-clocked watchdog timer with 1.6 s timeout (typ.), cleared by any WDI edge (≥50 ns), and supports manual reset via an internal 52 kΩ pull-up MR input. The device lacks watchdog disable control pins - WDI must be left floating or tristated to disable the function.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.3 V ±2.5% - ensures reliable detection of 3.3 V rail collapse across industrial temperature range |
| RST Pulse Width | 1.4 ms (typ.) - meets minimum reset hold time for ARM Cortex-M and similar MCUs |
| Watchdog Timeout | 1.6 s (typ.) - provides sufficient margin to detect firmware hangs without false triggers |
| Supply Current | 3 µA (typ.) at VCC < 3.6 V - enables always-on supervision in battery-backed or ultra-low-power systems |
| Operating Temp | –40 to +85 °C - qualified for industrial-grade embedded control and automation environments |
| VCC Min for RST | 1.0 V - guarantees functional reset assertion during deep brown-out or slow power-down sequences |
| Reset Output Type | Active-low, push-pull - drives reset line directly without external pull-up; sinks/source up to 20 mA |
Pinout & Package
STM6825SWY6F is housed in a standard 5-pin SOT23-5 package (JEDEC MO-178AB), with 1.3 mm height, 2.9 mm × 1.6 mm footprint, and gull-wing leads compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog input | Edge-sensitive input; toggling within 1.6 s prevents reset assertion; floating disables watchdog |
| 2 - VCC | Power supply | Monitored 3.3 V rail input; device operates from 1.0–5.5 V, but threshold is fixed at 3.3 V |
| 3 - RST | Active-low reset output | Push-pull driver; asserts low on fault, MR, or WDI timeout; holds low ≥1.4 ms after recovery |
| 4 - MR | Manual reset input | Active-low; internal 52 kΩ pull-up; debounced internally - no external RC required |
| 5 - VSS | Ground | Reference return path for comparator, watchdog, and output drivers; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.3 V monitoring | ±2.5% threshold accuracy over –40 to +85 °C ensures consistent brown-out detection across temperature |
| Guaranteed RST down to 1.0 V | Enables fail-safe reset assertion even during severe undervoltage events before full power collapse |
| Integrated watchdog timer | 1.6 s timeout with edge-triggered clear eliminates need for external timing components or MCU GPIO |
| Low-quiescent-current operation | 3 µA typical ICC allows permanent supervision in energy-constrained applications like smart sensors |
| SOT23-5 footprint | Standardized 5-pin package simplifies layout, reduces board space, and supports high-volume reflow assembly |
Applications
| Industrial PLC Controller | Medical Diagnostic Sensor Node |
|---|---|
Use Scenario: Power sequencing and runtime fault recovery in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary VCC supervisor and watchdog for main ARM-based controller; asserts RST on 3.3 V rail sag or firmware lockup. Use Value: Prevents uncontrolled state transitions during brown-out; 1.4 ms RST pulse satisfies IEC 61000-4-11 immunity test requirements for reset hold time. |
Use Scenario: Battery-powered portable ultrasound sensor with sleep/wake cycles and safety-critical boot integrity. IC Role / Device Role / Timing Role: Always-on supervisor monitoring 3.3 V LDO output; MR used for user-initiated recalibration reset; WDI fed by MCU heartbeat. Use Value: 3 µA ICC extends battery life; 1.0 V RST guarantee ensures deterministic reset even during end-of-life battery discharge. |
| Smart Energy Meter | Automotive Body Control Module (BCM) |
Use Scenario: Tamper-resistant metering unit requiring secure boot and runtime watchdog coverage under wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3 V MCU supply and feeds WDI with periodic SPI transaction pulses. Use Value: ±2.5% threshold stability over –40 to +85 °C eliminates calibration drift; SOT23-5 eases conformal coating and thermal management. |
Use Scenario: Non-safety-critical BCM sub-system (e.g., window lift control) needing robust power-on reset and software hang detection. IC Role / Device Role / Timing Role: Secondary supervisor for auxiliary microcontroller; RST tied to MCU reset pin; MR connected to service mode switch. Use Value: Push-pull RST avoids external pull-up, reducing BOM count; RoHS-compliant SOT23-5 meets automotive ELV directive requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM6823SWY6F | Same 3.3 V threshold, same SOT23-5, but RST is open-drain (not push-pull); no RST active-high output | Requires external pull-up resistor; incompatible where direct-drive reset is needed or board space is constrained | Select only if open-drain flexibility (e.g., level translation) is required and pull-up is acceptable |
| MAX6326UT29D3+T | 3.0 V threshold (±2.5%), 1.6 s watchdog, 2.5 µA ICC, SOT23-5 - identical timing but different VCC trip point | Not suitable for 3.3 V systems requiring tight 3.3 V tolerance; requires redesign of power rail monitoring strategy | Choose only when system uses 3.0 V core supply and MAX's tighter 1.5 ms RST pulse is preferred |
Compared with STM6825SWY6F, STM6823SWY6F trades push-pull drive for open-drain flexibility at the cost of added component count, while MAX6326UT29D3+T shifts the threshold to 3.0 V - making it unsuitable for 3.3 V rail supervision without circuit modification.
Availability
STM6825SWY6F is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic sensor nodes, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STM6825SWY6F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and embedded markets since 1987.
The STM6xxx series was developed specifically for cost-sensitive, space-constrained microprocessor supervision in industrial and medical equipment - prioritizing precision threshold stability, ultra-low ICC, and integrated watchdog functionality in minimal footprint.
FAQ
Can STM6825SWY6F monitor a 5 V supply?
No - STM6825SWY6F has a fixed 3.3 V ±2.5% reset threshold and is not adjustable. While it operates with VCC up to 5.5 V, it only supervises 3.3 V rails. For 5 V supervision, ST offers STM6821SWY6F (5.0 V threshold) or STM6322SWY6F (adjustable via external resistor divider).
Is the watchdog timer enabled by default?
Yes - the watchdog is active at power-up. To disable it, WDI must be left floating or driven by a tristated output. Leaving WDI unconnected causes the internal counter to generate a low-high-low pulse every 1.6 s, effectively servicing the watchdog without MCU intervention.
What is the maximum capacitive load on the RST output?
The RST output is rated for ≤20 mA sink/source and exhibits typical rise/fall times of <100 ns into 50 pF. ST recommends limiting total load capacitance to ≤100 pF to maintain clean edges and avoid timing violations in fast-reset MCU interfaces.
Does MR require external debounce circuitry?
No - the MR input includes internal hysteresis and filtering that rejects transients <100 ns. A normally open momentary switch connected between MR and GND operates reliably without external RC networks, though a 0.1 µF capacitor to GND is recommended in electrically noisy environments.
STM6825SWY6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
STM6825SWY6F FAQ
1.How can I place an order for STM6825SWY6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6825SWY6F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM6825SWY6F reliable?
The price and inventory of STM6825SWY6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6825SWY6F is usually 5 days.
3.What payment methods are accepted for STM6825SWY6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6825SWY6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6825SWY6F?
STM6825SWY6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6825SWY6F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM6825SWY6F?
For technical support, including STM6825SWY6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6825SWY6F requirements.
6.How does Aetrix verify that STM6825SWY6F is sourced from the original manufacturer or authorized distributors?
All STM6825SWY6F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM6825SWY6F meets industry standards.
7.What is the process for return or replacement of STM6825SWY6F?
All STM6825SWY6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6825SWY6F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM6825SWY6F part is unused and in its original packaging.
Return procedure for STM6825SWY6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6825SWY6F Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
Microchip Technology
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MCP111T-300E/TT
Microchip Technology
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MCP120T-315I/TT
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MCP809T-315I/TT
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